Re: [PROPOSAL]Support conditional return

[Jochen Theodorou]

On 26.07.20 20:23, Daniel Sun wrote:

Hi mg,

maybe you can give some real life code where you encounter this on a regular 
basis ?

Let's think about the case about choosing method by method name and arguments:

```
def chooseMethod(String methodName, Object[] arguments) {
    def methodChosen = doChooseMethod(methodName, arguments)
    if (null != methodChosen) return methodChosen

    methodChosen = doChooseMethod(methodName, 
adjustArguments(arguments.clone(), Character.TYPE))
    if (null != methodChosen) return methodChosen

    methodChosen = doChooseMethod(methodName, 
adjustArguments(arguments.clone(), Integer.TYPE))
    if (null != methodChosen) return methodChosen

    throw new GroovyRuntimeException("$methodName not found")
}
```

now that I would now maybe write like this:

def chooseMethod(String methodName, Object[] arguments) {
    def methodChosen = doChooseMethod(methodName, arguments)
    methodChosen ?: doChooseMethod(methodName, 
adjustArguments(arguments.clone(), Character.TYPE))
    methodChosen ?: doChooseMethod(methodName, 
adjustArguments(arguments.clone(), Integer.TYPE))
    if (null != methodChosen) return methodChosen

    throw new GroovyRuntimeException("$methodName not found")
}

compared to

The above code could be simplified as:
```
def chooseMethod(String methodName, Object[] arguments) {
    return? doChooseMethod(methodName, arguments)
    return? doChooseMethod(methodName, adjustArguments(arguments.clone(), 
Character.TYPE))
    return? doChooseMethod(methodName, adjustArguments(arguments.clone(), 
Integer.TYPE))

    throw new GroovyRuntimeException("$methodName not found")
}
```

bye Jochen